Looking for a little info on the Bianchi I picked up today. Looked through the 80's catalogs and didn't see anything about a "Special". Any info is appreciated.

Bianchi Special 58cm
S/N: BS449631
-Sakae CR cranks
-Shimano 600 shifters, brakes and rear derailleur
-Suntour Cyclone M-II front derailleur
-Bianchi Superset/Magny
-Araya 27 aluminum wheels with Suzie hubs.
-Kashima "Kashimax" Saddle